We have several gardens and meadows at the Stiperstones Inn. I get to do most of the gardening and for several years now I have been doing battle with ground elder! Wikipedia quotes “The plant is said to have been introduced into Great Britain by the Romans as a food plant and into Northern Europe as a medicinal herb by monks.” We haven’t tried eating it yet but the only way I seem to be able to get rid of it is by digging and fine riddling and then covering the area for at least a year.
I have got it all around my raspberries although I thought I had weeded thoroughly last year. I have spent all afternoon digging it up ( I never compost the roots or leaves) and I will add a top dressing of bark and horse manure.